A concise formal approach to the oxacephem skeleton from an intramolecular Peterson type olefination of N-[bis(trimethylsilyl)methyl]-β-lactams.

1. Palomo, C.
2. Aizpurua, J.M.
3. Garcta, J.M.
4. Paul Picard, J.
5. Dunogue ́s, J.